XML 27 R43.htm IDEA: XBRL DOCUMENT v2.4.1.9

Operating Leases (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014 sqft Location	Dec. 31, 2015 sqft
Operating Leased Assets [Line Items]
Lessee Leasing Agreements, Operating Leases, Area under Lease	36,700dhil_LesseeLeasingAgreementsOperatingLeasesAreaunderLease
Operating Lease Expense Excluding Rent	$ 300,000dhil_OperatingLeaseExpenseExcludingRent
Number of office space locations	3us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Operating Leases, Future Minimum Payments Due	6,282,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Contractual Reimbursement of Future Minimum Lease Payments Expected Over Life of Operating Lease Agreement	$ 300,000dhil_ContractualReimbursementofFutureMinimumLeasePaymentsExpectedOverLifeofOperatingLeaseAgreement
Scenario, Forecast [Member]
Operating Leased Assets [Line Items]
Lessee Leasing Agreements, Operating Leases, Area under Lease		42,400dhil_LesseeLeasingAgreementsOperatingLeasesAreaunderLease / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

X

- Definition

Contractual Reimbursement of Future Minimum Lease Payments Expected Over Life of Operating Lease Agreement

+ References

No definition available.

+ Details

Name:	dhil_ContractualReimbursementofFutureMinimumLeasePaymentsExpectedOverLifeofOperatingLeaseAgreement
Namespace Prefix:	dhil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Lessee Leasing Agreements, Operating Leases, Area under Lease

+ References

No definition available.

+ Details

Name:	dhil_LesseeLeasingAgreementsOperatingLeasesAreaunderLease
Namespace Prefix:	dhil_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Operating Lease Expense Excluding Rent

+ References

No definition available.

+ Details

Name:	dhil_OperatingLeaseExpenseExcludingRent
Namespace Prefix:	dhil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of units (items of property) under operating lease arrangements.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: